3866391 has 6 divisors (see below), whose sum is σ = 5584800. Its totient is φ = 2577588.

The previous prime is 3866333. The next prime is 3866393. The reversal of 3866391 is 1936683.

It is a happy number.

It is not a de Polignac number, because 3866391 - 2⁷ = 3866263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3866393) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214791 + ... + 214808.

It is an arithmetic number, because the mean of its divisors is an integer number (930800).

Almost surely, 2^3866391 is an apocalyptic number.

3866391 is a deficient number, since it is larger than the sum of its proper divisors (1718409).

3866391 is a wasteful number, since it uses less digits than its factorization.

3866391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429605 (or 429602 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 3866391 is about 1966.3140644363. The cubic root of 3866391 is about 156.9526274644.

The spelling of 3866391 in words is "three million, eight hundred sixty-six thousand, three hundred ninety-one".